EP3193516B1 - Loudspeaker and mobile body device having loudspeaker mounted thereon - Google Patents
Loudspeaker and mobile body device having loudspeaker mounted thereon Download PDFInfo
- Publication number
- EP3193516B1 EP3193516B1 EP15839082.3A EP15839082A EP3193516B1 EP 3193516 B1 EP3193516 B1 EP 3193516B1 EP 15839082 A EP15839082 A EP 15839082A EP 3193516 B1 EP3193516 B1 EP 3193516B1
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- EP
- European Patent Office
- Prior art keywords
- loudspeaker
- frame
- arms
- diaphragm
- magnet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
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- 230000001070 adhesive effect Effects 0.000 claims description 6
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- 230000004907 flux Effects 0.000 description 8
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- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
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Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
- H04R9/04—Construction, mounting, or centering of coil
- H04R9/045—Mounting
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
- H04R7/04—Plane diaphragms
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/06—Loudspeakers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
- H04R2201/02—Details casings, cabinets or mounting therein for transducers covered by H04R1/02 but not provided for in any of its subgroups
- H04R2201/028—Structural combinations of loudspeakers with built-in power amplifiers, e.g. in the same acoustic enclosure
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
- H04R2499/10—General applications
- H04R2499/13—Acoustic transducers and sound field adaptation in vehicles
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/16—Mounting or tensioning of diaphragms or cones
- H04R7/18—Mounting or tensioning of diaphragms or cones at the periphery
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
- H04R9/025—Magnetic circuit
Definitions
- the present disclosure relates to an electrodynamic loudspeaker used in audio systems and to a mobile device equipped with the loudspeaker.
- a conventional loudspeaker includes a frame, a diaphragm, a voice coil body, and a magnetic circuit.
- the diaphragm is connected at its outer peripheral end to the frame via an edge.
- the magnetic circuit has a magnetic gap and is connected to the frame.
- the voice coil body includes a bobbin and a voice coil wound near a first end of the bobbin.
- the bobbin is connected at one end to the diaphragm.
- the voice coil is located in the magnetic gap.
- Patent Literature 1 An example of a conventional technique related to the invention of the present application is shown in Patent Literature 1.
- the loudspeaker includes a frame, a diaphragm, an edge, a magnetic circuit, and a voice coil body.
- the frame has a cylindrical internal space.
- the diaphragm is located in the internal space of the frame.
- the edge connects the outer peripheral end of the diaphragm and the frame.
- the magnetic circuit includes a magnet and a bottom plate.
- the bottom plate includes an installation part and a plurality of arms.
- the installation part is located on the first side of the magnet and is magnetically connected to the magnet.
- the arms project from the installation part toward the outer periphery and are connected to the frame.
- the magnetic circuit is located in the internal space of the frame and has a magnetic gap.
- the voice coil body includes a cylindrical bobbin and a voice coil.
- the voice coil is wound around at least part of the bobbin.
- the voice coil body is located in the center of the diaphragm so that the voice coil can be located in the magnetic gap.
- the mobile device of the present disclosure includes a body, a drive part mounted in the body, an amplifier mounted in the body, and the loudspeaker of the present disclosure receiving an output of the amplifier.
- the present invention is defined in claims 1 and 11.
- Loudspeakers require a diaphragm and a magnetic circuit located close to each other in order to have a thin profile. Some loudspeakers include two edges instead of a damper in order to support the diaphragm to the frame. Unless the frame and the magnetic circuit have appropriate shapes and are connected properly, loudspeakers have a thick profile.
- Such loudspeakers are demanded to have a frame made of resin in terms of productivity and cost.
- the frame of the loudspeakers has many bent portions and therefore requires an opening for releasing the sound pressure (back pressure) generated on the rear side of the diaphragm.
- back pressure sound pressure
- loudspeakers have a complicated shape, making it sometimes difficult to have a resin frame in terms of productivity and strength.
- FIG. 1 is a perspective view of loudspeaker 51.
- FIG. 2 is a front view of loudspeaker 51.
- FIG. 3 is a sectional view taken along line 3-3 of FIG. 2 .
- FIG. 4 is a rear view of loudspeaker 51.
- the term "upward direction” represents the direction from magnetic circuit 61 toward diaphragm 53
- the term “downward direction” represents the direction from diaphragm 53 toward magnetic circuit 61 in FIG. 3 .
- the upward direction is toward the front side of diaphragm 53
- the downward direction is toward the rear side of diaphragm 53.
- arms 91 are composed of arms 91A-91D.
- Loudspeaker 51 includes frame 52, diaphragm 53, edge 54, magnetic circuit 61, and voice coil body 55.
- Frame 52 has cylindrical internal space 52D.
- Diaphragm 53 is located in internal space 52D of frame 52.
- Edge 54 connects the outer peripheral end of diaphragm 53 and frame 52.
- Magnetic circuit 61 includes magnet 62 and bottom plate 64.
- Bottom plate 64 includes installation part 64A and arms 91.
- Installation part 64A is located on the first side of magnet 62 and is magnetically connected to magnet 62.
- Arms 91 project from installation part 64A toward the outer periphery and are connected to frame 52.
- Magnetic circuit 61 is located in internal space 52D of frame 52 and has magnetic gap 56.
- Voice coil body 55 includes cylindrical bobbin 55A and voice coil 55B.
- Voice coil 55B is wound around at least part of bobbin 55A.
- Voice coil body 55 is located in the center (thin part 53A) of diaphragm 53, so that voice coil 55B can be located in magnetic gap 56.
- the above-described configuration allows loudspeaker 51 to have a thin profile.
- Magnetic circuit 61 and frame 52 are connected together via arms 91 and therefore, each two adjacent arms 91 are separated by an opening.
- frame 52 does not have to have an opening for releasing the sound pressure generated on the rear side of diaphragm 53, allowing frame 52 to have a simple shape.
- the sound pressure from the rear side of diaphragm 53 allows air to pass through the openings, thereby improving the effect of air-cooling magnetic circuit 61.
- FIG. 5 is a perspective view of frame 52 of loudspeaker 51.
- frame 52 includes base 52A and attachment part 52B.
- Base 52A is a hollow cylinder, and in other words, has cylindrical internal space 52D where diaphragm 53 and magnetic circuit 61 are located.
- Base 52A is preferably cylindrical in the case that diaphragm 53 is circular when seen from the front.
- Frame 52 does not have to include attachment part 52B, but preferably includes it for the following reason.
- Attachment part 52B allows loudspeaker 51 to be attached to a baffle board (not shown) or other device. If attachment part 52B has screw holes, loudspeaker 51 can be screwed to the baffle board.
- Loudspeaker 51 preferably includes terminal 57.
- the term "terminal 57" is used to collectively refer to positive terminal 57A and negative terminal 57B. Terminal 57 is fixed to the lateral side of base 52A of frame 52.
- diaphragm 53 has thin part 53A and thick part 53B formed around thin part 53A.
- Thin part 53A and thick part 53B define recess 41.
- Thick part 53B is formed on the outer periphery of diaphragm 53, and recess 41 is formed in the center of the rear side of diaphragm 53.
- the upper surface of magnetic circuit 61 is located facing thin part 53A.
- Thin part 53A is thinner than thick part 53B, and the upper surface of magnetic circuit 61 is located facing thin part 53A. As a result, the distance can be small between the upper surface of magnetic circuit 61 and the front side of diaphragm 53, allowing the loudspeaker to have a thin profile. Furthermore, thick part 53B formed on the outer periphery of diaphragm 53 increases the strength of diaphragm 53.
- FIG. 6 is an enlarged sectional view of an essential part of magnetic gap 56 of loudspeaker 51.
- Voice coil body 55 includes cylindrical bobbin 55A and voice coil 55B wound around at least part of bobbin 55A.
- the term "cylindrical” here includes rectangular-column shaped.
- Voice coil 55B is wound near the second end (rear side part) of bobbin 55A and is located in magnetic gap 56.
- diaphragm 53 vibrates according to the direction and magnitude of the drive signal.
- Diaphragm 53 is driven in the direction of the winding axis of voice coil 55B (vertical direction in FIG. 3 ) via bobbin 55A.
- edge 54 is used to collectively refer to first edge 54A and second edge 54B.
- First edge 54A and second edge 54B connect the outer peripheral end of diaphragm 53 and frame 52.
- Second edge 54B is preferably opposite to first edge 54A in the thickness direction of thick part 53B.
- Terminal 57 is located between first edge 54A and second edge 54B in the thickness direction of diaphragm 53 and is connected to connecting wire 58 (tinsel wire).
- Connecting wire 58 passes through a hole formed in thick part 53B and is led out to the rear side of thin part 53A of diaphragm 53.
- the start and end points of the wire of voice coil 55B are connected to connecting wire 58 on bobbin 55A.
- the drive signal to drive loudspeaker 51 is supplied to voice coil 55B through terminal 57 via connecting wire 58.
- Frame 52 preferably has affixing part 52C.
- the outer peripheries of first and second edges 54A and 54B are affixed to affixing part 52C.
- affixing part 52C is formed near the end of the front side of base 52A.
- Affixing part 52C is formed on the inner peripheral surface of base 52A in such a manner as to project toward the center of base 52A.
- Frame 52 is preferably made of synthetic resin. This configuration allows attachment part 52B and affixing part 52C to be integrally formed with base 52A, thereby having a high productivity of frame 52.
- Affixing part 52C preferably has an upper surface to which the outer periphery of first edge 54A is affixed and a lower surface to which second edge 54B is affixed.
- Affixing part 52C is not limited the structure to affix both of first edge 54A and second edge 54B to the lateral side of diaphragm 53.
- affixing part 52C may be used to affix either one of first edge 54A and second edge 54B to the lateral side of diaphragm 53.
- either one of edges 54A and 54B may be directly affixed to the inner peripheral surface of base 52A.
- diaphragm 53 The outer peripheral end of diaphragm 53 is connected to frame 52 via first and second edges 54A and 54B.
- the direction of the vibration (amplitude) of diaphragm 53 (vertical direction in FIG. 3 ) is perpendicular to the direction of the magnetic flux in magnetic gap 56.
- diaphragm 53 is displaced in the direction of the winding axis of voice coil 55B (vertical direction in FIG. 3 ) by first and second edges 54A and 54B.
- First edge 54A is located on the front side of diaphragm 53 with respect to the center in the thickness direction of diaphragm 53, and second edge 54B is located on the rear side of diaphragm 53 with respect to the center in the thickness direction of diaphragm 53.
- First edge 54A and second edge 54B are preferably symmetrical with respect to the plane perpendicular to the direction of the winding axis of voice coil 55B. This configuration allows diaphragm 53 to generate less rolling action, and to cause less distortion due to the asymmetry of the amplitude of diaphragm 53. It is further preferable that first edge 54A and second edge 54B be symmetrical with respect to the center in the thickness direction of diaphragm 53.
- first edge 54A with the front side of diaphragm 53 and to connect second edge 54B with the rear side of thick part 53B.
- joint 72 is formed parallel with the front or rear side of diaphragm 53. This configuration can provide a large distance between first edge 54A and second edge 54B, making diaphragm 53 have much less rolling action. Joint 72 joins diaphragm 53 and edge 54 (see FIG. 2 ).
- First edge 54A and diaphragm 53 may alternatively be connected together at a location away from the front-side end on the lateral side of diaphragm 53 toward the rear side, allowing loudspeaker 51 shown in FIG. 3 to have a thinner profile.
- Diaphragm 53 is preferably made of foamed resin so as to allow diaphragm 53 to be lightweight.
- the front side of diaphragm 53 is preferably flat.
- thin part 53A The rear side of thin part 53A is flat, and in thin part 53A, diaphragm 53 has a uniform thickness.
- the boundary portion between thin part 53A and thick part 53B gradually increase in thickness toward the outer periphery of diaphragm 53. More specifically, it is preferable to form inclined surface 53D gradually increasing in thickness from thin part 53A toward thick part 53B so as to enhance the strength of diaphragm 53.
- Diaphragm 53 is preferably composed of core material made of foamed resin and a reinforcement layer formed on at least one of the front and rear sides of the core material.
- the reinforcement layer can be made of carbon or metal like aluminum or titanium.
- the upper surface of magnetic circuit 61 is preferably located closer to the front side of diaphragm 53 than to the rear side of thick part 53B as shown in FIG. 3 .
- part of the magnetic circuit be located in thin part 53A so as to allow loudspeaker 51 to have a thin profile.
- tapered part 65A On the lateral side of magnetic circuit 61.
- inclined surface 53D is preferably located facing tapered part 65A so as to have the distance large enough to displace the amplitude of diaphragm 53 in the axial direction of the voice coil between diaphragm 53 and magnetic circuit 61. This allows the upper surface of magnetic circuit 61 and the front side of diaphragm 53 to be located close to each other.
- Magnetic circuit 61 is preferably of internal magnet type so as to allow thin part 53A to have a small area, and hence, diaphragm 53 to have high strength.
- Magnetic circuit 61 of internal magnet type includes magnet 62, top plate 63, bottom plate 64, and yoke 65.
- Magnet 62 is columnar and is magnetized in the vertical thickness direction.
- Top plate 63 is planar and is placed on the upper surface of magnet 62.
- Bottom plate 64 has installation part 64A and arms 91.
- Magnet 62 is placed on the upper surface of installation part 64A.
- Bottom plate 64 is magnetically connected to magnet 62.
- Yoke 65 extends upward from the outer peripheral end of the upper side of installation part 64A, and is magnetically connected to magnet 62 via bottom plate 64.
- Top plate 63, installation part 64A, and yoke 65 are made of magnetic material, such as hot-rolled steel plates (for example, SPHC and SPHD).
- FIG. 7 is a sectional view of a bonding area where bottom plate 64 and yoke 65 are bonded together in loudspeaker 51. It is preferable that bottom plate 64 and yoke 65 be bonded together with an adhesive. In addition, as shown in FIG. 7 , it is possible to form recess 66 for holding the adhesive on the bonding surface between bottom plate 64 and yoke 65. Recess 66 is only required to be formed on at least one of bottom plate 64 and yoke 65. Recess 66 is composed of, for example, grooves of V-shaped cross section and can be formed by knurling the bonding surface of at least one of bottom plate 64 and yoke 65. The adhesive held in recess 66 allows bottom plate 64 and yoke 65 to be tightly bonded together.
- Magnet 62 magnetizes top plate 63 and yoke 65 with opposite polarities.
- the inner peripheral surface of yoke 65 is located facing the outer peripheral surface of top plate 63 so as to form magnetic gap 56 therebetween as shown in FIG. 3 .
- the magnetic flux in magnetic gap 56 flows from top plate 63 to yoke 65.
- tapered part 65A is formed on the outer peripheral surface of yoke 65.
- yoke 65 is preferably tapered from bottom plate 64 toward its tip.
- tapered part 65A which tapers from the lower surface toward the upper surface, is formed on the outer peripheral surface of magnetic circuit 61.
- Tapered part 65A may be linear, curved (such as arc-shaped), step-like, or of a combination of them.
- Inclined surface 53D is thicker than thin part 53A, so that diaphragm 53 can be stronger and less deformed in the region having inclined surface 53D. This prevents inclined surface 53D from colliding with tapered part 65A regardless of the small distance between them. As a result, diaphragm 53 can be made thick in inclined surface 53D, and hence improved in strength.
- Magnetic circuit 61 is preferably circular when seen from the front, and in this case, magnet 62 is preferably cylindrical.
- Top plate 63 is preferably disc-shaped, and in this case, diaphragm 53 is preferably either circular or oval when seen from the front.
- magnetic circuit 61 may be oval or rectangular when seen from the front.
- bobbin 55A and top plate 63 are preferably oval when seen from the front, and diaphragm 53 is preferably either oval or rectangular when seen from the front.
- bobbin 55A and diaphragm 53 are preferably rectangular when seen from the front.
- Magnet 62 is preferably formed of a neodymium magnet because of its high energy product. This achieves a desired magnetic flux density in magnetic gap 56, allowing magnet 62 and hence the loudspeaker to have a thin profile.
- bottom plate 64 includes installation part 64A and a plurality of arms 91. Arms 91 extend from installation part 64A toward the outer periphery and are connected to frame 52. With this configuration, magnetic circuit 61 is connected to frame 52 via arms 91.
- arms 91 preferably have engaging portions 91E at their respective tips.
- Engaging portions 91E can be, for example, projections such as bumps.
- FIG. 8 is an enlarged view of to-be-engaged portion 52E of frame 52 in loudspeaker 51.
- base 52A of frame 52 have to-be-engaged portions 52E, which are recesses such as grooves or cutouts, for example.
- Engaging portions 91E of arms 91 are engaged with to-be-engaged portions 52E of frame 52.
- Engaging portions 91E shown in FIG. 4 project from the tips of arms 91 and have a smaller width than arms 91 have.
- to-be-engaged portions 52E are holes formed at the bottom on the outer side (the side far from diaphragm 53) of frame 52.
- each to-be-engaged portion 52E includes insertion slot 52F and locking portion 52G. Insertion slots 52F are wider than engaging portions 91E shown in FIG. 4 .
- Locking portions 52G are formed contiguous with and inside insertion slots 52F. Locking portions 52G are wider than insertion slots 52F in the circumferential direction of base 52A.
- Engaging portions 91E shown in FIG. 4 are inserted into locking portions 52G through insertion slots 52F of to-be-engaged portions 52E shown in FIG. 8 . More specifically, engaging portions 91E of all arms 91 shown in FIG. 4 are inserted into locking portions 52G of the respective to-be-engaged portions 52E. After this, frame 52 is rotated along the circumference of base 52A with respect to magnetic circuit 61 so that engaging portions 91E are engaged with the respective to-be-engaged portions 52E. After being engaged with each other, engaging portions 91E (see FIG. 4 ) and to-be-engaged portions 52E (see FIGS. 5 and 8 ) are preferably bonded together with an adhesive so as to prevent resonance. Thus, magnetic circuit 61 is connected to frame 52 via arms 91.
- bottom plate 64 includes four arms 91A-91D extending in four directions perpendicular to each other. Each two adjacent arms 91 are separated by opening 92. Openings 92 allow diaphragm 53 to vibrate without being disturbed by the sound pressure (back pressure) from its rear side. Openings 92 also prevent the magnetic flux in magnetic circuit 61 from leaking to arms 91, thereby increasing the magnetic flux density in magnetic gap 56.
- Installation part 64A and arms 91 are preferably integrally formed. This configuration makes it unnecessary to use a member for fixing magnetic circuit 61 to frame 52, thereby making bottom plate 64 thin and low cost.
- installation part 64A and arms 91 may be formed separately and combined together. In this case, it is preferable that installation part 64A be made of magnetic material, and that arms 91 be made of non-magnetic material. This configuration reduces magnetic field leakage to arms 91 and increases the magnetic flux density in magnetic gap 56.
- FIG. 9 is an enlarged view of fins 93 formed on arms 91 in loudspeaker 51. As shown in FIG. 9 , it is possible to provide fins 93 on the outer periphery of arms 91 so as to increase the surface area of arms 91, thereby efficiently cooling magnetic circuit 61.
- FIG. 10 is an enlarged view of fins 94 formed on installation part 64A in loudspeaker 51.
- bottom plate 64 may have fins 94 on the outer periphery of installation part 64A. Fins 94 increase the surface area of bottom plate 64, thereby efficiently cooling magnetic circuit 61.
- Bottom plate 64 can be a flat metal plate, so that fins 93 and 94 can be formed integrally with bottom plate 64 by sheet metal working, thereby having a high productivity of loudspeaker 51.
- Base 52A of frame 52 is formed in cylindrical shape.
- Base 52A has a simple shape because of not having bent portions or an opening for releasing the back pressure of the diaphragm.
- frame 52 of the present embodiment can have a simple shape.
- FIG. 11 is a sectional view of another loudspeaker 251 according to the present exemplary embodiment.
- loudspeaker 251 the same components as in loudspeaker 51 are denoted by the same reference numerals, and the description thereof will be omitted.
- Loudspeaker 251 includes magnetic circuit 81 of external magnet type instead of magnetic circuit 61 of internal magnet type.
- Magnetic circuit 81 includes ring-shaped magnet 82, ring-shaped top plate 83, and bottom plate 84.
- Bottom plate 84 includes installation part 84A and center pole 84B.
- Center pole 84B extends upward from the center of installation part 84A.
- Magnet 82 is placed on the upper surface of installation part 84A, which is located outside center pole 84B.
- Top plate 83 is placed on the upper surface of magnet 82.
- the outer peripheral surface of center pole 84B is located facing the inner peripheral surface of top plate 83, and magnetic gap 56 is formed therebetween.
- center pole 84B is used as the yoke located facing top plate 83.
- magnetic circuit 81 is located facing thin part 53A, so that loudspeaker 251 can have a thin profile even in the case that magnetic circuit 81 is of external magnet type.
- tapered part 65A be formed on the outer peripheral surface of top plate 83 and that tapered part 65A be located facing inclined surface 53D of recess 41.
- Magnet 82 may be a bond magnet so as to be formed into a variety of shapes.
- Tapered part 65A is also preferably formed on the outer peripheral surface of magnet 82. Tapered part 65A and inclined surface 53D are preferably located facing each other.
- FIG. 12 is a sectional view of still another loudspeaker 151 according to the present exemplary embodiment.
- FIG. 13 is a rear view of yet another loudspeaker 151 according to the present exemplary embodiment.
- Loudspeaker 151 includes magnetic circuit 161 and pedestal 152 instead of magnetic circuit 61 of loudspeaker 51.
- Pedestal 152 includes mounting part 152A and arms 153.
- Magnetic circuit 161 includes magnet 62, top plate 63, and bottom plate 164.
- Bottom plate 164 which is a cylinder with a bottom, includes installation part 64A and yoke 65. Installation part 64A and yoke 65 are preferably integrally formed.
- Mounting part 152A is formed in the center of pedestal 152. Magnetic circuit 161 is placed on the upper surface of mounting part 152A and is fixed to pedestal 152. The fixation may be achieved by screwing, bonding, or other methods.
- mounting part 152A is preferably made of magnetic material, such as hot-rolled steel plates (for example, SPHC and SPHD). As a result, mounting part 152A functions as a magnetic path in magnetic circuit 161. With this configuration, the magnetoresistance is small in the region under the outer peripheral surface of magnet 62, thereby achieving a low magnetic saturation of magnetic circuit 161 and a large magnetic flux density in magnetic gap 56.
- Pedestal 152 includes arms 153 extending from mounting part 152A toward the outer periphery. The tips of arms 153 are fixed to frame 52 and, consequently, magnetic circuit 161 is fixed to frame 52.
- Mounting part 152A and arms 153 are preferably integrally formed, but may alternatively be formed separately and combined together. In this case, arms 153 are preferably made of non-magnetic material so as to prevent the magnetic flux in magnetic circuit 161 from leaking to arms 153.
- Pedestal 152 preferably includes a plurality of arms 153 arranged at regular intervals.
- FIG. 13 shows six arms 153A-153F extending radially from mounting part 152A toward the outer periphery. Arms 153A-153F are preferably arranged at 60-degree intervals around the center of mounting part 152A.
- each two adjacent arms 153 are separated by opening 92. Openings 92 allow diaphragm 53 to vibrate without being disturbed by the sound pressure (back pressure) from its rear side.
- arms 153 are preferably provided at their tips with engaging portions 91E to be engaged with frame 52.
- Frame 52 preferably has to-be-engaged portions 52E to be engaged with engaging portions 91E.
- Engaging portions 91E can be, for example, projections such as bump.
- to-be-engaged portions 52E can be, for example, recesses such as grooves and cutouts. The projections can be fitted into the recesses so that pedestal 152 can be fixed to frame 52.
- arms 153 may have fins 93 on the outer periphery so as to increase at least one of the surface area and volume of arms 153, thereby efficiently cooling magnetic circuit 161.
- Pedestal 152 can be a flat metal plate, so that fins 93 can be formed integrally with pedestal 152 by sheet metal working, thereby having a high productivity of the loudspeaker.
- installation part 64A may have fins 94 on its outer periphery.
- FIG. 14 is a conceptual view of mobile device 201 according to the present exemplary embodiment.
- Mobile device 201 is equipped with loudspeaker 500.
- Loudspeaker 500 represents one of loudspeakers 51, 151, and 251 according to the present exemplary embodiment.
- mobile device 201 is an automobile, but may be other vehicles such as ships, airplanes, trains, and motorcycles.
- Mobile device 201 includes body 202, drive part 203, amplifier 211, and loudspeaker 500.
- Drive part 203, amplifier 211, and loudspeaker 500 are mounted in body 202.
- Drive part 203 may include an engine, a motor, tires, a steering wheel, and other parts.
- the output of amplifier 211 is supplied to loudspeaker 500.
- Amplifier 211 may include part of a car audio system, and additionally include a sound reproducing device. Also, amplifier 211 may include part of a car navigation system, and additionally include a display device.
- Body 202 includes passenger space 202A. Loudspeaker 500 is placed to deliver sound to passenger space 202A. Body 202 may further include exterior part 202B and interior part 202C. Exterior part 202B, which isolates passenger space 202A from the outside, can be, for example, roof 202D or door 202E. Interior part 202C is located between exterior part 202B and passenger space 202A. Loudspeaker 500 is placed between interior part 202C and exterior part 202B, but may alternatively be placed in a dashboard, a rear tray (not shown), or other places.
- Loudspeaker 500 of the present exemplary embodiment has a thin profile and therefore can have a short distance between interior part 202C and exterior part 202B. In other words, loudspeaker 500 can be placed even if the distance is short between interior and exterior parts 202C and 202B. Thus, the use of loudspeaker 500 as mobile device 201 expands passenger space 202A.
- the above-described exemplary embodiment is an example to facilitate the understanding of the present invention and does not limit the invention thereto.
- the materials and shapes of the components of loudspeaker 500 described in the exemplary embodiment can be variously modified.
- the magnetic circuit is located in the internal space of the frame. Furthermore, the plurality of arms is connected to the frame and project toward the outer periphery of the magnetic circuit, thereby allowing the loudspeaker to have a thin profile.
- the magnetic circuit is connected to the frame by the plurality of arms, and adjacent arms are separated by an opening.
- the loudspeaker of the present disclosure has a thin profile and is therefore suitable for use especially in in-car audio systems and home audio systems.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
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- Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
Description
- The present disclosure relates to an electrodynamic loudspeaker used in audio systems and to a mobile device equipped with the loudspeaker.
- A conventional loudspeaker includes a frame, a diaphragm, a voice coil body, and a magnetic circuit. The diaphragm is connected at its outer peripheral end to the frame via an edge. The magnetic circuit has a magnetic gap and is connected to the frame. The voice coil body includes a bobbin and a voice coil wound near a first end of the bobbin. The bobbin is connected at one end to the diaphragm. The voice coil is located in the magnetic gap.
- An example of a conventional technique related to the invention of the present application is shown in Patent Literature 1.
- PTL 1: Japanese Unexamined Patent Application Publication No.
2011-35812 US-A-2007102270 andEP-A-735795 - The loudspeaker includes a frame, a diaphragm, an edge, a magnetic circuit, and a voice coil body.
- The frame has a cylindrical internal space.
- The diaphragm is located in the internal space of the frame.
- The edge connects the outer peripheral end of the diaphragm and the frame.
- The magnetic circuit includes a magnet and a bottom plate.
- The bottom plate includes an installation part and a plurality of arms.
- The installation part is located on the first side of the magnet and is magnetically connected to the magnet.
- The arms project from the installation part toward the outer periphery and are connected to the frame.
- The magnetic circuit is located in the internal space of the frame and has a magnetic gap.
- The voice coil body includes a cylindrical bobbin and a voice coil.
- The voice coil is wound around at least part of the bobbin.
- The voice coil body is located in the center of the diaphragm so that the voice coil can be located in the magnetic gap.
- The mobile device of the present disclosure includes a body, a drive part mounted in the body, an amplifier mounted in the body, and the loudspeaker of the present disclosure receiving an output of the amplifier. The present invention is defined in claims 1 and 11.
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FIG. 1 is a perspective view of a loudspeaker according to a present exemplary embodiment. -
FIG. 2 is a front view of the loudspeaker according to the present exemplary embodiment. -
FIG. 3 is a sectional view taken along line 3-3 ofFIG. 2 . -
FIG. 4 is a rear view of the loudspeaker according to the present exemplary embodiment. -
FIG. 5 is a perspective view of a frame of the loudspeaker according to the present exemplary embodiment. -
FIG. 6 is an enlarged sectional view of an essential part of a magnetic gap in the loudspeaker according to the present exemplary embodiment. -
FIG. 7 is a sectional view of a bonding area where a bottom plate and a yoke are bonded together in the loudspeaker according to the present exemplary embodiment. -
FIG. 8 is an enlarged view of a to-be-engaged portion of a frame in the loudspeaker according to the present exemplary embodiment. -
FIG. 9 is an enlarged view of fins formed on arms in the loudspeaker according to the present exemplary embodiment. -
FIG. 10 is an enlarged view of fins formed on an installation part in the loudspeaker according to the present exemplary embodiment. -
FIG. 11 is a sectional view of another loudspeaker according to the present exemplary embodiment. -
FIG. 12 is a sectional view of still another loudspeaker according to the present exemplary embodiment. -
FIG. 13 is a rear view of the still another loudspeaker according to the present exemplary embodiment. -
FIG. 14 is a conceptual view of a mobile device according to the present exemplary embodiment. - Loudspeakers require a diaphragm and a magnetic circuit located close to each other in order to have a thin profile. Some loudspeakers include two edges instead of a damper in order to support the diaphragm to the frame. Unless the frame and the magnetic circuit have appropriate shapes and are connected properly, loudspeakers have a thick profile.
- Such loudspeakers are demanded to have a frame made of resin in terms of productivity and cost. The frame of the loudspeakers, however, has many bent portions and therefore requires an opening for releasing the sound pressure (back pressure) generated on the rear side of the diaphragm. As a result, loudspeakers have a complicated shape, making it sometimes difficult to have a resin frame in terms of productivity and strength.
- Loudspeakers come in various shapes depending on the application. For example, in-car loudspeakers need to have a thin profile because they are placed in small spaces such as a dashboard, a door, or a roof.
Thin loudspeaker 51 according to the present exemplary embodiment will now be described with reference to drawings.FIG. 1 is a perspective view ofloudspeaker 51.FIG. 2 is a front view ofloudspeaker 51.FIG. 3 is a sectional view taken along line 3-3 ofFIG. 2 .FIG. 4 is a rear view ofloudspeaker 51. The term "upward direction" represents the direction frommagnetic circuit 61 towarddiaphragm 53, and the term "downward direction" represents the direction fromdiaphragm 53 towardmagnetic circuit 61 inFIG. 3 . InFIG. 3 , the upward direction is toward the front side ofdiaphragm 53, and the downward direction is toward the rear side ofdiaphragm 53. InFIG. 4 ,arms 91 are composed ofarms 91A-91D. - Loudspeaker 51 includes
frame 52,diaphragm 53,edge 54,magnetic circuit 61, andvoice coil body 55. -
Frame 52 has cylindricalinternal space 52D. -
Diaphragm 53 is located ininternal space 52D offrame 52. - Edge 54 connects the outer peripheral end of
diaphragm 53 andframe 52. -
Magnetic circuit 61 includesmagnet 62 andbottom plate 64. -
Bottom plate 64 includesinstallation part 64A andarms 91. -
Installation part 64A is located on the first side ofmagnet 62 and is magnetically connected tomagnet 62. -
Arms 91 project frominstallation part 64A toward the outer periphery and are connected to frame 52. -
Magnetic circuit 61 is located ininternal space 52D offrame 52 and hasmagnetic gap 56. -
Voice coil body 55 includescylindrical bobbin 55A andvoice coil 55B. -
Voice coil 55B is wound around at least part ofbobbin 55A. -
Voice coil body 55 is located in the center (thin part 53A) ofdiaphragm 53, so thatvoice coil 55B can be located inmagnetic gap 56. - The above-described configuration allows
loudspeaker 51 to have a thin profile. -
Magnetic circuit 61 andframe 52 are connected together viaarms 91 and therefore, each twoadjacent arms 91 are separated by an opening. As a result,frame 52 does not have to have an opening for releasing the sound pressure generated on the rear side ofdiaphragm 53, allowingframe 52 to have a simple shape. The sound pressure from the rear side ofdiaphragm 53 allows air to pass through the openings, thereby improving the effect of air-coolingmagnetic circuit 61. -
Loudspeaker 51 will now be described in more detail.FIG. 5 is a perspective view offrame 52 ofloudspeaker 51. As shown inFIG. 5 ,frame 52 includesbase 52A andattachment part 52B.Base 52A is a hollow cylinder, and in other words, has cylindricalinternal space 52D wherediaphragm 53 andmagnetic circuit 61 are located.Base 52A is preferably cylindrical in the case that diaphragm 53 is circular when seen from the front.Frame 52 does not have to includeattachment part 52B, but preferably includes it for the following reason.Attachment part 52B allowsloudspeaker 51 to be attached to a baffle board (not shown) or other device. Ifattachment part 52B has screw holes,loudspeaker 51 can be screwed to the baffle board. -
Loudspeaker 51 preferably includesterminal 57. The term "terminal 57" is used to collectively refer topositive terminal 57A andnegative terminal 57B.Terminal 57 is fixed to the lateral side ofbase 52A offrame 52. - As shown in
FIG. 3 ,diaphragm 53 hasthin part 53A andthick part 53B formed aroundthin part 53A.Thin part 53A andthick part 53B definerecess 41.Thick part 53B is formed on the outer periphery ofdiaphragm 53, andrecess 41 is formed in the center of the rear side ofdiaphragm 53. The upper surface ofmagnetic circuit 61 is located facingthin part 53A. -
Thin part 53A is thinner thanthick part 53B, and the upper surface ofmagnetic circuit 61 is located facingthin part 53A. As a result, the distance can be small between the upper surface ofmagnetic circuit 61 and the front side ofdiaphragm 53, allowing the loudspeaker to have a thin profile. Furthermore,thick part 53B formed on the outer periphery ofdiaphragm 53 increases the strength ofdiaphragm 53. -
FIG. 6 is an enlarged sectional view of an essential part ofmagnetic gap 56 ofloudspeaker 51.Voice coil body 55 includescylindrical bobbin 55A andvoice coil 55B wound around at least part ofbobbin 55A. The term "cylindrical" here includes rectangular-column shaped. One end ofbobbin 55A, or in other words, the first end (front side part) ofbobbin 55A, is connected tothin part 53A ofrecess 41.Voice coil 55B is wound near the second end (rear side part) ofbobbin 55A and is located inmagnetic gap 56. When a drive signal is supplied tovoice coil 55B,diaphragm 53 vibrates according to the direction and magnitude of the drive signal.Diaphragm 53 is driven in the direction of the winding axis ofvoice coil 55B (vertical direction inFIG. 3 ) viabobbin 55A. - The term "
edge 54" is used to collectively refer tofirst edge 54A andsecond edge 54B. First edge 54A andsecond edge 54B connect the outer peripheral end ofdiaphragm 53 andframe 52.Second edge 54B is preferably opposite tofirst edge 54A in the thickness direction ofthick part 53B. -
Terminal 57 is located betweenfirst edge 54A andsecond edge 54B in the thickness direction ofdiaphragm 53 and is connected to connecting wire 58 (tinsel wire). Connectingwire 58 passes through a hole formed inthick part 53B and is led out to the rear side ofthin part 53A ofdiaphragm 53. The start and end points of the wire ofvoice coil 55B are connected to connectingwire 58 onbobbin 55A. The drive signal to driveloudspeaker 51 is supplied tovoice coil 55B throughterminal 57 via connectingwire 58. -
Frame 52 preferably has affixingpart 52C. In this case, the outer peripheries of first andsecond edges part 52C. To achieve this, affixingpart 52C is formed near the end of the front side ofbase 52A. Affixingpart 52C is formed on the inner peripheral surface ofbase 52A in such a manner as to project toward the center ofbase 52A.Frame 52 is preferably made of synthetic resin. This configuration allowsattachment part 52B and affixingpart 52C to be integrally formed withbase 52A, thereby having a high productivity offrame 52. - Affixing
part 52C preferably has an upper surface to which the outer periphery offirst edge 54A is affixed and a lower surface to whichsecond edge 54B is affixed. As a result, first andsecond edges loudspeaker 51. - Affixing
part 52C is not limited the structure to affix both offirst edge 54A andsecond edge 54B to the lateral side ofdiaphragm 53. Alternatively, affixingpart 52C may be used to affix either one offirst edge 54A andsecond edge 54B to the lateral side ofdiaphragm 53. Further alternatively, either one ofedges base 52A. - The outer peripheral end of
diaphragm 53 is connected to frame 52 via first andsecond edges FIG. 3 ) is perpendicular to the direction of the magnetic flux inmagnetic gap 56. Thus,diaphragm 53 is displaced in the direction of the winding axis ofvoice coil 55B (vertical direction inFIG. 3 ) by first andsecond edges -
First edge 54A is located on the front side ofdiaphragm 53 with respect to the center in the thickness direction ofdiaphragm 53, andsecond edge 54B is located on the rear side ofdiaphragm 53 with respect to the center in the thickness direction ofdiaphragm 53. - First edge 54A and
second edge 54B are preferably symmetrical with respect to the plane perpendicular to the direction of the winding axis ofvoice coil 55B. This configuration allowsdiaphragm 53 to generate less rolling action, and to cause less distortion due to the asymmetry of the amplitude ofdiaphragm 53. It is further preferable thatfirst edge 54A andsecond edge 54B be symmetrical with respect to the center in the thickness direction ofdiaphragm 53. - It is also preferable to connect
first edge 54A with the front side ofdiaphragm 53 and to connectsecond edge 54B with the rear side ofthick part 53B. In this case, joint 72 is formed parallel with the front or rear side ofdiaphragm 53. This configuration can provide a large distance betweenfirst edge 54A andsecond edge 54B, makingdiaphragm 53 have much less rolling action. Joint 72 joinsdiaphragm 53 and edge 54 (seeFIG. 2 ). -
First edge 54A anddiaphragm 53 may alternatively be connected together at a location away from the front-side end on the lateral side ofdiaphragm 53 toward the rear side, allowingloudspeaker 51 shown inFIG. 3 to have a thinner profile. -
Diaphragm 53 is preferably made of foamed resin so as to allowdiaphragm 53 to be lightweight. The front side ofdiaphragm 53 is preferably flat. - The rear side of
thin part 53A is flat, and inthin part 53A,diaphragm 53 has a uniform thickness. - It is preferable that the boundary portion between
thin part 53A andthick part 53B gradually increase in thickness toward the outer periphery ofdiaphragm 53. More specifically, it is preferable to forminclined surface 53D gradually increasing in thickness fromthin part 53A towardthick part 53B so as to enhance the strength ofdiaphragm 53. -
Diaphragm 53 is preferably composed of core material made of foamed resin and a reinforcement layer formed on at least one of the front and rear sides of the core material. The reinforcement layer can be made of carbon or metal like aluminum or titanium. - Furthermore, the upper surface of
magnetic circuit 61 is preferably located closer to the front side ofdiaphragm 53 than to the rear side ofthick part 53B as shown inFIG. 3 . In short, it is preferable that part of the magnetic circuit be located inthin part 53A so as to allowloudspeaker 51 to have a thin profile. - It is preferable to form
tapered part 65A on the lateral side ofmagnetic circuit 61. In this case,inclined surface 53D is preferably located facingtapered part 65A so as to have the distance large enough to displace the amplitude ofdiaphragm 53 in the axial direction of the voice coil betweendiaphragm 53 andmagnetic circuit 61. This allows the upper surface ofmagnetic circuit 61 and the front side ofdiaphragm 53 to be located close to each other. -
Magnetic circuit 61 is preferably of internal magnet type so as to allowthin part 53A to have a small area, and hence,diaphragm 53 to have high strength.Magnetic circuit 61 of internal magnet type includesmagnet 62,top plate 63,bottom plate 64, andyoke 65.Magnet 62 is columnar and is magnetized in the vertical thickness direction.Top plate 63 is planar and is placed on the upper surface ofmagnet 62.Bottom plate 64 hasinstallation part 64A andarms 91.Magnet 62 is placed on the upper surface ofinstallation part 64A.Bottom plate 64 is magnetically connected tomagnet 62.Yoke 65 extends upward from the outer peripheral end of the upper side ofinstallation part 64A, and is magnetically connected tomagnet 62 viabottom plate 64.Top plate 63,installation part 64A, andyoke 65 are made of magnetic material, such as hot-rolled steel plates (for example, SPHC and SPHD). -
FIG. 7 is a sectional view of a bonding area wherebottom plate 64 andyoke 65 are bonded together inloudspeaker 51. It is preferable thatbottom plate 64 andyoke 65 be bonded together with an adhesive. In addition, as shown inFIG. 7 , it is possible to formrecess 66 for holding the adhesive on the bonding surface betweenbottom plate 64 andyoke 65.Recess 66 is only required to be formed on at least one ofbottom plate 64 andyoke 65.Recess 66 is composed of, for example, grooves of V-shaped cross section and can be formed by knurling the bonding surface of at least one ofbottom plate 64 andyoke 65. The adhesive held inrecess 66 allowsbottom plate 64 andyoke 65 to be tightly bonded together. -
Magnet 62 magnetizestop plate 63 andyoke 65 with opposite polarities. The inner peripheral surface ofyoke 65 is located facing the outer peripheral surface oftop plate 63 so as to formmagnetic gap 56 therebetween as shown inFIG. 3 . In the case thattop plate 63 is magnetized with the north pole and thatyoke 65 is magnetized with the south pole, the magnetic flux inmagnetic gap 56 flows fromtop plate 63 toyoke 65. - It is preferable to form
tapered part 65A on the outer peripheral surface ofyoke 65. In other words,yoke 65 is preferably tapered frombottom plate 64 toward its tip. As a result, taperedpart 65A, which tapers from the lower surface toward the upper surface, is formed on the outer peripheral surface ofmagnetic circuit 61.Tapered part 65A may be linear, curved (such as arc-shaped), step-like, or of a combination of them. -
Inclined surface 53D is thicker thanthin part 53A, so thatdiaphragm 53 can be stronger and less deformed in the region having inclinedsurface 53D. This preventsinclined surface 53D from colliding withtapered part 65A regardless of the small distance between them. As a result,diaphragm 53 can be made thick ininclined surface 53D, and hence improved in strength. -
Magnetic circuit 61 is preferably circular when seen from the front, and in this case,magnet 62 is preferably cylindrical.Top plate 63 is preferably disc-shaped, and in this case,diaphragm 53 is preferably either circular or oval when seen from the front. - Instead of being circular,
magnetic circuit 61 may be oval or rectangular when seen from the front. In the case thatmagnetic circuit 61 is oval,bobbin 55A andtop plate 63 are preferably oval when seen from the front, anddiaphragm 53 is preferably either oval or rectangular when seen from the front. Meanwhile, in the case thatmagnetic circuit 61 is rectangular,bobbin 55A anddiaphragm 53 are preferably rectangular when seen from the front. -
Magnet 62 is preferably formed of a neodymium magnet because of its high energy product. This achieves a desired magnetic flux density inmagnetic gap 56, allowingmagnet 62 and hence the loudspeaker to have a thin profile. - Arms 91will now be described in detail. As shown in
FIG. 4 ,bottom plate 64 includesinstallation part 64A and a plurality ofarms 91.Arms 91 extend frominstallation part 64A toward the outer periphery and are connected to frame 52. With this configuration,magnetic circuit 61 is connected to frame 52 viaarms 91. - As shown in
FIG. 4 ,arms 91 preferably have engagingportions 91E at their respective tips.Engaging portions 91E can be, for example, projections such as bumps.FIG. 8 is an enlarged view of to-be-engaged portion 52E offrame 52 inloudspeaker 51. As shown inFIG. 8 , it is preferable thatbase 52A offrame 52 have to-be-engaged portions 52E, which are recesses such as grooves or cutouts, for example.Engaging portions 91E ofarms 91 are engaged with to-be-engaged portions 52E offrame 52. -
Engaging portions 91E shown inFIG. 4 project from the tips ofarms 91 and have a smaller width thanarms 91 have. Meanwhile, as shown inFIG. 5 , to-be-engaged portions 52E are holes formed at the bottom on the outer side (the side far from diaphragm 53) offrame 52. As shown inFIG. 8 , each to-be-engaged portion 52E includesinsertion slot 52F and lockingportion 52G.Insertion slots 52F are wider than engagingportions 91E shown inFIG. 4 . Lockingportions 52G are formed contiguous with and insideinsertion slots 52F. Lockingportions 52G are wider thaninsertion slots 52F in the circumferential direction ofbase 52A. -
Engaging portions 91E shown inFIG. 4 are inserted into lockingportions 52G throughinsertion slots 52F of to-be-engaged portions 52E shown inFIG. 8 . More specifically, engagingportions 91E of allarms 91 shown inFIG. 4 are inserted into lockingportions 52G of the respective to-be-engaged portions 52E. After this,frame 52 is rotated along the circumference ofbase 52A with respect tomagnetic circuit 61 so that engagingportions 91E are engaged with the respective to-be-engaged portions 52E. After being engaged with each other, engagingportions 91E (seeFIG. 4 ) and to-be-engaged portions 52E (seeFIGS. 5 and8 ) are preferably bonded together with an adhesive so as to prevent resonance. Thus,magnetic circuit 61 is connected to frame 52 viaarms 91. - In
FIG. 4 ,bottom plate 64 includes fourarms 91A-91D extending in four directions perpendicular to each other. Each twoadjacent arms 91 are separated by opening 92.Openings 92 allowdiaphragm 53 to vibrate without being disturbed by the sound pressure (back pressure) from its rear side.Openings 92 also prevent the magnetic flux inmagnetic circuit 61 from leaking toarms 91, thereby increasing the magnetic flux density inmagnetic gap 56. -
Installation part 64A andarms 91 are preferably integrally formed. This configuration makes it unnecessary to use a member for fixingmagnetic circuit 61 to frame 52, thereby makingbottom plate 64 thin and low cost. Alternatively,installation part 64A andarms 91 may be formed separately and combined together. In this case, it is preferable thatinstallation part 64A be made of magnetic material, and thatarms 91 be made of non-magnetic material. This configuration reduces magnetic field leakage toarms 91 and increases the magnetic flux density inmagnetic gap 56. -
FIG. 9 is an enlarged view offins 93 formed onarms 91 inloudspeaker 51. As shown inFIG. 9 , it is possible to providefins 93 on the outer periphery ofarms 91 so as to increase the surface area ofarms 91, thereby efficiently coolingmagnetic circuit 61. -
FIG. 10 is an enlarged view offins 94 formed oninstallation part 64A inloudspeaker 51. As shown inFIG. 10 ,bottom plate 64 may havefins 94 on the outer periphery ofinstallation part 64A.Fins 94 increase the surface area ofbottom plate 64, thereby efficiently coolingmagnetic circuit 61. -
Bottom plate 64 can be a flat metal plate, so thatfins bottom plate 64 by sheet metal working, thereby having a high productivity ofloudspeaker 51. -
Base 52A offrame 52 is formed in cylindrical shape.Base 52A has a simple shape because of not having bent portions or an opening for releasing the back pressure of the diaphragm. Thus, frame 52 of the present embodiment can have a simple shape. - Instead of being of the internal magnet type,
magnetic circuit 61 may be of external magnet type or a combination of the internal and external magnet types.FIG. 11 is a sectional view of anotherloudspeaker 251 according to the present exemplary embodiment. Inloudspeaker 251, the same components as inloudspeaker 51 are denoted by the same reference numerals, and the description thereof will be omitted. -
Loudspeaker 251 includesmagnetic circuit 81 of external magnet type instead ofmagnetic circuit 61 of internal magnet type.Magnetic circuit 81 includes ring-shapedmagnet 82, ring-shapedtop plate 83, andbottom plate 84.Bottom plate 84 includesinstallation part 84A andcenter pole 84B.Center pole 84B extends upward from the center ofinstallation part 84A.Magnet 82 is placed on the upper surface ofinstallation part 84A, which is locatedoutside center pole 84B.Top plate 83 is placed on the upper surface ofmagnet 82. The outer peripheral surface ofcenter pole 84B is located facing the inner peripheral surface oftop plate 83, andmagnetic gap 56 is formed therebetween. - In the case that
magnetic circuit 81 of external magnet type is used,center pole 84B is used as the yoke located facingtop plate 83. - Thus,
magnetic circuit 81 is located facingthin part 53A, so thatloudspeaker 251 can have a thin profile even in the case thatmagnetic circuit 81 is of external magnet type. - It is preferable that
tapered part 65A be formed on the outer peripheral surface oftop plate 83 and thattapered part 65A be located facinginclined surface 53D ofrecess 41.Magnet 82 may be a bond magnet so as to be formed into a variety of shapes.Tapered part 65A is also preferably formed on the outer peripheral surface ofmagnet 82.Tapered part 65A andinclined surface 53D are preferably located facing each other. -
FIG. 12 is a sectional view of still anotherloudspeaker 151 according to the present exemplary embodiment.FIG. 13 is a rear view of yet anotherloudspeaker 151 according to the present exemplary embodiment. Inloudspeaker 151, the same components as inloudspeakers Loudspeaker 151 includesmagnetic circuit 161 andpedestal 152 instead ofmagnetic circuit 61 ofloudspeaker 51.Pedestal 152 includes mountingpart 152A andarms 153. -
Magnetic circuit 161 includesmagnet 62,top plate 63, andbottom plate 164.Bottom plate 164, which is a cylinder with a bottom, includesinstallation part 64A andyoke 65.Installation part 64A andyoke 65 are preferably integrally formed. - Mounting
part 152A is formed in the center ofpedestal 152.Magnetic circuit 161 is placed on the upper surface of mountingpart 152A and is fixed topedestal 152. The fixation may be achieved by screwing, bonding, or other methods. - The magnetic saturation of
bottom plate 164 is likely to occur under the outer peripheral surface ofmagnet 62. For this reason, mountingpart 152A is preferably made of magnetic material, such as hot-rolled steel plates (for example, SPHC and SPHD). As a result, mountingpart 152A functions as a magnetic path inmagnetic circuit 161. With this configuration, the magnetoresistance is small in the region under the outer peripheral surface ofmagnet 62, thereby achieving a low magnetic saturation ofmagnetic circuit 161 and a large magnetic flux density inmagnetic gap 56. -
Pedestal 152 includesarms 153 extending from mountingpart 152A toward the outer periphery. The tips ofarms 153 are fixed to frame 52 and, consequently,magnetic circuit 161 is fixed to frame 52. Mountingpart 152A andarms 153 are preferably integrally formed, but may alternatively be formed separately and combined together. In this case,arms 153 are preferably made of non-magnetic material so as to prevent the magnetic flux inmagnetic circuit 161 from leaking toarms 153. -
Pedestal 152 preferably includes a plurality ofarms 153 arranged at regular intervals.FIG. 13 shows sixarms 153A-153F extending radially from mountingpart 152A toward the outer periphery.Arms 153A-153F are preferably arranged at 60-degree intervals around the center of mountingpart 152A. Whenmagnetic circuit 161 is connected to frame 52 byarms 153, each twoadjacent arms 153 are separated by opening 92.Openings 92 allowdiaphragm 53 to vibrate without being disturbed by the sound pressure (back pressure) from its rear side. - Similar to
arms 91,arms 153 are preferably provided at their tips with engagingportions 91E to be engaged withframe 52.Frame 52 preferably has to-be-engaged portions 52E to be engaged withengaging portions 91E.Engaging portions 91E can be, for example, projections such as bump. Note here that to-be-engaged portions 52E can be, for example, recesses such as grooves and cutouts. The projections can be fitted into the recesses so thatpedestal 152 can be fixed toframe 52. - In addition, as shown in
FIG. 9 ,arms 153 may havefins 93 on the outer periphery so as to increase at least one of the surface area and volume ofarms 153, thereby efficiently coolingmagnetic circuit 161. -
Pedestal 152 can be a flat metal plate, so thatfins 93 can be formed integrally withpedestal 152 by sheet metal working, thereby having a high productivity of the loudspeaker. Moreover, as shown inFIG. 10 ,installation part 64A may havefins 94 on its outer periphery. -
FIG. 14 is a conceptual view ofmobile device 201 according to the present exemplary embodiment.Mobile device 201 is equipped withloudspeaker 500.Loudspeaker 500 represents one ofloudspeakers FIG. 14 ,mobile device 201 is an automobile, but may be other vehicles such as ships, airplanes, trains, and motorcycles. -
Mobile device 201 includesbody 202, drivepart 203,amplifier 211, andloudspeaker 500. Drivepart 203,amplifier 211, andloudspeaker 500 are mounted inbody 202. Drivepart 203 may include an engine, a motor, tires, a steering wheel, and other parts. The output ofamplifier 211 is supplied toloudspeaker 500.Amplifier 211 may include part of a car audio system, and additionally include a sound reproducing device. Also,amplifier 211 may include part of a car navigation system, and additionally include a display device. -
Body 202 includespassenger space 202A.Loudspeaker 500 is placed to deliver sound topassenger space 202A.Body 202 may further includeexterior part 202B andinterior part 202C.Exterior part 202B, which isolatespassenger space 202A from the outside, can be, for example,roof 202D ordoor 202E.Interior part 202C is located betweenexterior part 202B andpassenger space 202A.Loudspeaker 500 is placed betweeninterior part 202C andexterior part 202B, but may alternatively be placed in a dashboard, a rear tray (not shown), or other places. -
Loudspeaker 500 of the present exemplary embodiment has a thin profile and therefore can have a short distance betweeninterior part 202C andexterior part 202B. In other words,loudspeaker 500 can be placed even if the distance is short between interior andexterior parts loudspeaker 500 asmobile device 201 expandspassenger space 202A. - The above-described exemplary embodiment is an example to facilitate the understanding of the present invention and does not limit the invention thereto. The materials and shapes of the components of
loudspeaker 500 described in the exemplary embodiment can be variously modified. - The present invention, without departing from the spirit thereof, may be modified or improved and may include equivalents thereof.
- As described above, in the loudspeaker of the present disclosure, the magnetic circuit is located in the internal space of the frame. Furthermore, the plurality of arms is connected to the frame and project toward the outer periphery of the magnetic circuit, thereby allowing the loudspeaker to have a thin profile. In addition, the magnetic circuit is connected to the frame by the plurality of arms, and adjacent arms are separated by an opening. With this configuration, the frame does not need to have an opening for releasing the sound pressure generated on the rear side of the diaphragm, and hence, can have a simple shape. Furthermore, the sound pressure from the rear side of the diaphragm allows air to pass through the openings, thereby improving the effect of air-cooling the magnetic circuit.
- The loudspeaker of the present disclosure has a thin profile and is therefore suitable for use especially in in-car audio systems and home audio systems.
-
- 41
- recess
- 51
- loudspeaker
- 52
- frame
- 52A
- base
- 52B
- attachment part
- 52C
- affixing part
- 53
- diaphragm
- 53A
- thin part
- 53B
- thick part
- 53D
- inclined surface
- 54
- edge
- 54A
- first edge
- 54B
- second edge
- 55
- voice coil body
- 55A
- bobbin
- 55B
- voice coil
- 56
- magnetic gap
- 57
- terminal
- 57A
- positive terminal
- 57B
- negative terminal
- 58
- connecting wire
- 61
- magnetic circuit
- 62
- magnet
- 63
- top plate
- 64
- bottom plate
- 64A
- installation part
- 65
- yoke
- 65A
- tapered part
- 66
- recess
- 72
- joint
- 81
- magnetic circuit
- 82
- magnet
- 83
- top plate
- 84
- bottom plate
- 84A
- installation part
- 84B
- center pole
- 91
- arm
- 91A
- arm
- 91B
- arm
- 91C
- arm
- 91D
- arm
- 91E
- engaging portion
- 92
- opening
- 93
- fin
- 151
- loudspeaker
- 152
- pedestal
- 152A
- mounting part
- 153
- arm
- 153A
- arm
- 153B
- arm
- 153C
- arm
- 153D
- arm
- 153E
- arm
- 153F
- arm
- 153G
- arm
- 161
- magnetic circuit
- 164
- bottom plate
- 201
- mobile device
- 202
- body
- 202A
- passenger space
- 202B
- exterior part
- 202C
- interior part
- 202D
- roof
- 202E
- door
- 203
- drive part
- 211
- amplifier
- 251
- loudspeaker
- 500
- loudspeaker
Claims (19)
- A loudspeaker (51) comprising:a frame (52) having a cylindrical internal space;a diaphragm (53) located in the internal space of the frame (52);an edge (54) connecting an outer peripheral end of the diaphragm (53) and the frame (52);a magnetic circuit (61) located in the internal space of the frame (52) and having a magnetic gap (56), the magnetic circuit (61) including:a magnet (62); anda bottom plate (64) including:an installation part (64A) located on a first side of the magnet (62) and magnetically connected to the magnet (62); anda plurality of arms (91); anda voice coil body (41) including:a cylindrical bobbin (43); anda voice coil (45) wound around at least part of the bobbin (43),the voice coil body (41) being located in a center of the diaphragm (53) so that the voice coil (45) can be located in the magnetic gap (56),wherein the plurality of arms (91) is projected from the installation part (64A) toward an outer periphery and connected to the frame (52),characterized in thateach of the arms (91) has an engaging portion (91E) at a tip thereof, andthe frame (52) has a to-be-engaged portion (52E) to be engaged with the engaging portion (91E).
- The loudspeaker of claim 1, wherein the magnetic circuit (61) further includes:a top plate (63) located on a second side opposite to the first side of the magnet (62); anda yoke (65) located around the top plate (63) and facing the top plate (63) with the magnetic gap (56) therebetween, the yoke (65) being magnetically connected to the magnet (62) via the installation part (64A).
- The loudspeaker of claim 2, wherein at least one of the bottom plate (64) and the yoke (65) has a recess (66) to hold an adhesive.
- The loudspeaker of claim 1, wherein the arms (91) and the installation part (64A) are integrally formed.
- The loudspeaker of claim 1, wherein the arms (91) are made of non-magnetic material.
- The loudspeaker of claim 1, wherein each of the arms (91) has a fin (93) on an outer periphery thereof.
- The loudspeaker of claim 1, wherein the installation part (64A) has a fin (94) on an outer periphery thereof.
- The loudspeaker of claim 1, wherein the engaging portion (91E) and the to-be-engaged portion (52E) are engaged with each other and bonded with an adhesive.
- The loudspeaker of claim 1, wherein
the engaging portion (91E) is a projection;
the to-be-engaged portion (52E) is a recess including:an insertion slot (52F); anda locking portion (52G) continuous with, and wider than, the insertion slot (52F). - The loudspeaker of claim 1, wherein the frame (52) is made of synthetic resin.
- A loudspeaker comprising:a frame (52) having a cylindrical internal space;a diaphragm (63) located in the internal space of the frame;an edge (54) connecting an outer peripheral end of the diaphragm (53) and the frame (52);a magnetic circuit (161) located in the internal space of the frame (52) and having a magnetic gap (56), the magnetic circuit including:a magnet (62); anda bottom plate (164) including an installation part (64A) located on a first side of the magnet (62) and magnetically connected to the magnet (62);a voice coil body (41) including:a cylindrical bobbin (43); anda voice coil (45) wound around at least part of the bobbin (43), wherein the voice coil body (41) is located in a center of the diaphragm (53) so that the voice coil (45) can be located in the magnetic gap (56);a mounting part (152A) connected to the magnetic circuit (62); anda plurality of arms (91) projecting from the mounting part (152A) toward an outer periphery and connected to the frame (52),characterized in thateach of the arms (91) has an engaging portion (91E) at a tip thereof, andthe frame (52) has a to-be-engaged portion (52E) to be engaged with the engaging portion (91E).
- The loudspeaker of claim 11, wherein the magnetic circuit further includes:a top plate (63) located on a second side opposite to the first side of the magnet (62); anda yoke (65) located around the top plate (63) and facing the top plate (63) with the magnetic gap (56) therebetween, the yoke (65) being magnetically connected to the magnet (62) via the installation part (64A).
- The loudspeaker of claim 11, wherein the arms (91) and the mounting part (152A) are integrally formed.
- The loudspeaker of claim 11, wherein the arms (91) are made of non-magnetic material.
- The loudspeaker of claim 11, wherein each of the arms (91) has a fin (93) on an outer periphery thereof.
- The loudspeaker of claim 11, wherein the installation part (64A) has a fin (94) on an outer periphery thereof.
- A mobile device comprising:a body;a drive part mounted in the body;an amplifier mounted in the body; andthe loudspeaker of any one of claims 1 to 16, the loudspeaker being configured to receive an output of the amplifier.
- The mobile device of claim 17, wherein
the body (202) includes:an interior part (202C); andan exterior part (202B) covering an outer periphery of the interior part (202C) with a predetermined space from the interior part, andthe loudspeaker (700) is located in the space. - The mobile device of claim 18, wherein the exterior part (202B) is either a door (202E) or a roof (202D).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2014183938 | 2014-09-10 | ||
PCT/JP2015/004193 WO2016038812A1 (en) | 2014-09-10 | 2015-08-21 | Loudspeaker and mobile body device having loudspeaker mounted thereon |
Publications (3)
Publication Number | Publication Date |
---|---|
EP3193516A1 EP3193516A1 (en) | 2017-07-19 |
EP3193516A4 EP3193516A4 (en) | 2017-07-19 |
EP3193516B1 true EP3193516B1 (en) | 2018-04-18 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15839082.3A Active EP3193516B1 (en) | 2014-09-10 | 2015-08-21 | Loudspeaker and mobile body device having loudspeaker mounted thereon |
Country Status (5)
Country | Link |
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US (1) | US9894443B2 (en) |
EP (1) | EP3193516B1 (en) |
JP (1) | JP6634605B2 (en) |
CN (1) | CN105745944A (en) |
WO (1) | WO2016038812A1 (en) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105684464A (en) | 2014-07-04 | 2016-06-15 | 松下知识产权经营株式会社 | Loudspeaker and mobile device incorporating same |
CN108322870B (en) * | 2018-02-02 | 2021-01-29 | 瑞声科技(新加坡)有限公司 | Sound production device |
CN208369831U (en) * | 2018-05-04 | 2019-01-11 | 惠州超声音响有限公司 | A kind of loudspeaker of symmetrical double folding ring |
US11948549B2 (en) | 2019-07-17 | 2024-04-02 | Sound Solutions International Co., Ltd. | Electromagnetic actuator for a display with improved spring arrangement and output device with said actuator |
JP2021164045A (en) | 2020-03-31 | 2021-10-11 | パナソニックIpマネジメント株式会社 | Speaker diaphragm, speaker, speaker diaphragm manufacturing method, electronic device, and mobile device |
GB2594746A (en) * | 2020-05-07 | 2021-11-10 | Pss Belgium Nv | Loudspeaker and method for manufacturing the same |
CN113727257B (en) * | 2020-05-20 | 2024-01-30 | 奥音科技(镇江)有限公司 | Electrodynamic exciter, speaker, electrodynamic transducer and output device |
US11838736B2 (en) | 2020-05-20 | 2023-12-05 | Sound Solutions International Co., Ltd. | Electromagnetic actuator for a speaker or a sound transducer with a multimetal layer connection between the voice coil and the magnet system |
JP7510312B2 (en) | 2020-09-04 | 2024-07-03 | ホシデン株式会社 | Speaker |
EP4287650A4 (en) * | 2021-02-01 | 2024-08-07 | Samsung Electronics Co., Ltd. | SPEAKER WITH IMPROVED BL CHARACTERISTICS AND ELECTRONIC DEVICE |
Family Cites Families (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2566604A (en) * | 1948-03-16 | 1951-09-04 | William C Eaves | Electrodynamic loud-speaker assembly |
JP3041567B2 (en) | 1993-12-13 | 2000-05-15 | ミネベア株式会社 | Speaker with detachable mechanism |
US5848173A (en) * | 1995-03-30 | 1998-12-08 | Pioneer Electronic Corporation | Surroundless loudspeaker |
US6675931B2 (en) * | 1998-11-30 | 2004-01-13 | Joseph Yaacoub Sahyoun | Low profile audio speaker |
US6449376B1 (en) * | 1999-09-20 | 2002-09-10 | Boston Acoustics, Inc. | Planar-type loudspeaker with at least two diaphragms |
US6229902B1 (en) * | 1999-11-09 | 2001-05-08 | Lucio Proni | Loudspeaker with frame cooling structure |
JP4530872B2 (en) | 2005-02-17 | 2010-08-25 | パイオニア株式会社 | Frame for speaker device and speaker device |
JP4499580B2 (en) * | 2005-02-17 | 2010-07-07 | パイオニア株式会社 | Frame for speaker device and speaker device |
JP4305454B2 (en) * | 2005-10-06 | 2009-07-29 | ソニー株式会社 | Actuator, touch panel display device and electronic device |
KR100782912B1 (en) | 2006-02-16 | 2007-12-07 | 주식회사 두비원 | Remote control treadmill system and its control method |
TWI359619B (en) | 2007-02-13 | 2012-03-01 | Cotron Corp | Micro speaker |
JP2009094977A (en) * | 2007-10-12 | 2009-04-30 | Citizen Electronics Co Ltd | Electroacoustic transducer and method of manufacturing the same |
US8126187B2 (en) * | 2007-10-29 | 2012-02-28 | Bose Corporation | Vehicle audio system including door-mounted components |
EP2180721A1 (en) * | 2008-10-21 | 2010-04-28 | Lautsprecher Teufel GmbH | Flat membrane loudspeaker |
JP2010154443A (en) * | 2008-12-26 | 2010-07-08 | Pioneer Electronic Corp | Magnetic circuit for loudspeaker, loudspeaker device and electronic equipment |
JP4754012B2 (en) | 2009-08-05 | 2011-08-24 | フォスター電機株式会社 | Speaker device |
US20110044491A1 (en) * | 2009-08-23 | 2011-02-24 | Plastoform Industries Ltd. | Long excursion loudspeaker with closed magnetic circuit and ribbed robbin extending through slotted yoke |
CN102045623B (en) * | 2009-10-23 | 2014-12-10 | 清华大学 | Vibration diaphragm, preparation method thereof and speaker with same |
US8879774B2 (en) * | 2011-04-12 | 2014-11-04 | Harman International Industries, Incorporated | Loudspeaker magnet assembly with two inner magnets comprising a central bore |
CN102711022A (en) * | 2012-05-30 | 2012-10-03 | 汉得利(常州)电子有限公司 | Magnetic circuit device for loudspeaker and combined magnetic circuit loudspeaker |
-
2015
- 2015-08-21 JP JP2016514206A patent/JP6634605B2/en not_active Expired - Fee Related
- 2015-08-21 WO PCT/JP2015/004193 patent/WO2016038812A1/en active Application Filing
- 2015-08-21 US US15/023,311 patent/US9894443B2/en active Active
- 2015-08-21 EP EP15839082.3A patent/EP3193516B1/en active Active
- 2015-08-21 CN CN201580002677.1A patent/CN105745944A/en active Pending
Non-Patent Citations (1)
Title |
---|
None * |
Also Published As
Publication number | Publication date |
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US9894443B2 (en) | 2018-02-13 |
WO2016038812A1 (en) | 2016-03-17 |
US20160249137A1 (en) | 2016-08-25 |
CN105745944A (en) | 2016-07-06 |
JPWO2016038812A1 (en) | 2017-06-22 |
JP6634605B2 (en) | 2020-01-22 |
EP3193516A1 (en) | 2017-07-19 |
EP3193516A4 (en) | 2017-07-19 |
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